单项选择题
A.0.005mm B.0.01mm C.0.02mm D.0.05mm
A.1min B.3min C.5min D.10min
A.一位 B.两位 C.三位 D.四位
A.5X10X55mm B.7.5x10x55mm C.7x10x55mm D.10x10x55mm
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